19439843419 has 4 divisors (see below), whose sum is σ = 19440139320. Its totient is φ = 19439547520.

The previous prime is 19439843399. The next prime is 19439843453. The reversal of 19439843419 is 91434893491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91434893491 = 134699 ⋅678809.

It is a cyclic number.

It is not a de Polignac number, because 19439843419 - 2¹¹ = 19439841371 is a prime.

It is a super-2 number, since 2×19439843419² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19439843419.

It is not an unprimeable number, because it can be changed into a prime (19439843459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262 + ... + 197179.

It is an arithmetic number, because the mean of its divisors is an integer number (4860034830).

Almost surely, 2^19439843419 is an apocalyptic number.

19439843419 is a deficient number, since it is larger than the sum of its proper divisors (295901).

19439843419 is an equidigital number, since it uses as much as digits as its factorization.

19439843419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295900.

The product of its digits is 3359232, while the sum is 55.

The spelling of 19439843419 in words is "nineteen billion, four hundred thirty-nine million, eight hundred forty-three thousand, four hundred nineteen".